Tongwei THC G12-66 Bifacial vs Tongwei TWMNH-66HD
VS
The verdict
THC G12-66 Bifacial leads on the differences that matter
The largest is module efficiency: 0.85 pp more efficient. 7 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 11 differencesHow alike are they
7
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
11 of 18 parameters
What actually differs
Parameter
THC G12-66 Bifacial
TWMNH-66HD
Difference
Module efficiency
23.80 %
22.95 %
0.85 pp more efficient
Rated power
740 Wp
620 Wp
120 W more power
Weight
37.0 kg
29.0 kg
8.0 kg lighter
Power density
238.2 Wp/m²
229.5 Wp/m²
8.7 Wp/m² higher
Short-circuit current
18.47 A
16.06 A
2.41 A apart
Module area
3.106 m²
2.701 m²
0.405 m² apart
Weight per kWp
50.0 kg/kWp
46.8 kg/kWp
3.2 kg/kWp lighter
Current at max power
17.49 A
15.19 A
2.30 A apart
Open-circuit voltage
50.62 V
49.10 V
1.52 V apart
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
Voltage at max power
42.32 V
40.82 V
1.50 V apart
02
What it means on a roof
Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.280 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
THC G12-66 Bifacial
24,828 kWh
TWMNH-66HD
20,802 kWh
Lifetime gap
4,026 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
THC G12-66 Bifacial
TWMNH-66HD
Standard test conditions
25 °C
100.0% of rated power
740 W
620 W
Cool, bright day
40 °C
95.8% of rated power
709 W
594 W
Typical summer roof
55 °C
91.6% of rated power
678 W
568 W
Hot roof
70 °C
87.4% of rated power
647 W
542 W
03
Full specification
Parameter
THC G12-66 Bifacial
TWMNH-66HD
Difference
Power and efficiency
Rated power
740 Wp
620 Wp
+120 W for THC G12-66 Bifacial
Module efficiency
23.80 %
22.95 %
+0.85 pp for THC G12-66 Bifacial
Power density
238.2 Wp/m²
229.5 Wp/m²
+8.7 Wp/m² for THC G12-66 Bifacial
Open-circuit voltage
50.62 V
49.10 V
1.52 V apart
Voltage at max power
42.32 V
40.82 V
1.50 V apart
Short-circuit current
18.47 A
16.06 A
2.41 A apart
Current at max power
17.49 A
15.19 A
2.30 A apart
Temperature
Temperature coefficient
-0.280 %/°C
-0.280 %/°C
Same
Mechanical
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
Module area
3.106 m²
2.701 m²
0.405 m² apart
Weight
37.0 kg
29.0 kg
-8.0 kg for TWMNH-66HD
Weight per kWp
50.0 kg/kWp
46.8 kg/kWp
-3.2 kg/kWp for TWMNH-66HD
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
-
-
Neither datasheet publishes this
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#433
vs
#2,268
THC G12-66 Bifacial leads by 1,835 places
Power density
#431
vs
#2,191
THC G12-66 Bifacial leads by 1,760 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#3,317
vs
#1,343
TWMNH-66HD leads by 1,974 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#130
vs
#2,013
THC G12-66 Bifacial leads by 1,883 places
05
Open the full database
More useful comparisons
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Same manufacturer
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06
Written summary
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07
Questions about this pairing
Which panel is better: Tongwei THC G12-66 Bifacial or Tongwei TWMNH-66HD?
According to our database: Tongwei THC G12-66 Bifacial has higher module efficiency (23.80% vs 22.95%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei THC G12-66 Bifacial and Tongwei TWMNH-66HD?
Tongwei THC G12-66 Bifacial has a module efficiency of 23.80%, while Tongwei TWMNH-66HD is 22.95%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei THC G12-66 Bifacial use vs Tongwei TWMNH-66HD?
Tongwei THC G12-66 Bifacial uses TOPCon cells; Tongwei TWMNH-66HD uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on Tongwei THC G12-66 Bifacial and Tongwei TWMNH-66HD?
Tongwei THC G12-66 Bifacial has a 30 years power warranty; Tongwei TWMNH-66HD has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.
Are Tongwei THC G12-66 Bifacial and Tongwei TWMNH-66HD bifacial panels?
Both Tongwei THC G12-66 Bifacial and Tongwei TWMNH-66HD are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.
Shop prices: See 71 Tongwei offers
Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.